Figure 3.

Moderated mediation. A. The path coefficients for rs2832407*C homozygotes, which show significant effects of medication group on self-efficacy level and of self-efficacy level on nighttime drinking level, but no direct effect of medication group on nighttime drinking level (which prior to the inclusion of self-efficacy level was significant, consistent with mediation by self-efficacy level). B. The path coefficients for rs2832407*A-allele carriers, which show only a significant effect of self-efficacy level on nighttime drinking level, exclude the possibility of mediation by self-efficacy.